Rotary pump with liner plate



A o 9! l n ug 927 P. l. NAGLE l ROTARY PUMP WITH LINER PLATE Filed Sept. 11. 1926 rasees aug. 9, 1927.

En STATES PATNT .PERRY I. NAGLE, 0l? GHICAGO HEIGET'ILLINIS, ASSIGNE. T@ AMERIGN NESE STEEL COMPANY, OF CHICAGO, ILLINGIS, CGRPDRJTIN ananas I mana.

ROTARY PUE? WITH LINER PLATE.

Application' le Santena.: 11, 1926. Serial No. 134,78?,

This invention relates topumps of the lrind in which an impeller rotating within a shell, draws in fluid through an axial openin z in one end of the shell and eXpels it; e through a discharge port at a tangent to the shell, and particularly to rotary pumps of the kind in which one end, wall ofthe pumpine chamber is provided with a liner plate to save the wall. proper. from wear which is very considerable, particularly when the pump is used for dredging sand. gravel, and the like.

lin rotary pumps with liner plates as heretofore constructed, it has been the practice to apply the yplate to the dat inner surface of the end wall and secure it there by screws passing through the end wall and into the plate, but this method of providing the end wall with a liner plate is objectionable ben A -4 cause of the relatively light and unsubstantial construction of liner plate admissible in the space available between the end wall and the' impeller, also the relativelyinsecure attachment affordedby tapping screws directly into the plate, as well 'as the unsatisfactory bearing between the liner plate and the-end wall, developed by such securing means, and the difficulty of providing screw l threads in a plate which, to render the best service, should be made of cast manganese steel.

The object oi the present invention is to improve the construction of the liner plate for use in the situation named, as well as the construction of theshell and end Wall which develop the recess in which the liner` plate is received and thereby avoid all of the enumerated objections and obtain other advantages which will be apparent as the description proceeds. Tn carrying out the present invention, yay relatively deep recess is developed between the pumping chamber or working space of the shell` and the inner end wall which carries the liner plate. and the liner plate is provided near its' center and perimeter with offsetting lugs attendingr in the direction of the axis of rotation, away from the workingr chamber of the pump and toward the back wall, and through means of these luLjsthe liner plate is stepped against the end wall. The dimensions oi these lugs are such that the inner face of tbc liner plate is positioned to form a continuation of that portion of the inner wall of tbc workin;r chamber which is provided by the shell,

.transverse section. i

provide a dee the back wall besides provid means in the slotted lugs of and p lrecess which admits of being made more substantial,- ing'space for special inciting form 'of radially ventendiria: a hind that will receive the necks and heads oi securing bolts and whlerl can therefore be produced in the 'casting process and without resort to threading, ma chining or finishingT work. other than that of' grinding, which :method alone is commercially feasible in manaa'nese steel worlr. Such a construction of liner plate is very much more substantial both in its inherent 'structure and in its application to the end wali of the shell, besides being;r more readily applied; and the radially spaced offsets ai; the center and perimeter ci the plate` leave a very substantial intermediate annular space which admits ot' a hub-like formation in the end wall itself. that renders the latter more substantial in its structure and better adapted for articulation with the barrel or cylindrical 'portion which surrounds the pump shaft.

In they accompanyingl drawing, Figure 1 is a vertical axial section, and Figure 2 is 'an inner end elevation of a pump in which thefpneerredorm of the in vention is embodied l'tiio (inner end wall and ports in the rear thereof ing;r omitted in 85 p shaft being shown in Figure 2 and the'p'uzn 1' represents 'the sl1ell,vl'I the axial intake port in the frontier outer end wall thereof,- and 3 the tangential dischargeport oi a' known type of centrifugal rotary pump. It is customary to' providepumps of this kind with centricallv bored inner end walls 4 secured to 'thelshell 1 through means of an annular series of bolts 5 and to protect that surface of the end wall 4 which is presented toward the impeller il, through 'means of a lliner plate. secured to the said end wall and accommodated in a recess provided by an offset in the shell. The present invention employs a liner plate 7 in substantially this relation and develops the offset to receive yit through means of a flange-8 on the shell l, extending axially to the rear and then radially to Vprovide engagement for the bolts 5; but the present invention makes the odsetting flange 8 very much deeper than heretofore, so that instead of merely accommodatingr the thickness of the plate 7, it will deu velop a recess suiicient to accommodate a no lili deep axially extending flange 9 on theliner plate, through which the outer margin of lli-e liner plate may be stepped against the end 'Wall Ll, and which-,liner plate'flangc 9, in tnrn, develops a substantial recess il) sutiic nt 'to accommodate slotted. boltinglugs il. extendins rl lyinward from the `rear mai-zin ci' pinglilange 9 and alsosulm bicient te reci e the heads ol bolts l2 inserted in t? s of said-lugs and extending rardy i rough and netted upon the end By this expedient, it becomes prac ticanle to bring the center annular flange which liner plates have generally been provided, into stepped bearin against the inner lace ofthe rear Wall ot the shell, in substantially the same plane with the lace t receives the marginal stepping flange 9 therebyeliminate the annular recess intheend 'Wall which has heretofore been provided at seme additional expense, to receive said central flange; besides a more substanarticulation. of the liner plate with tbe end wall is afforded by the system oit bolts and ings, offset radially 'inward from the enter perimeter or the liner plate, which in tern insures a better stepped bearing of the dimage against inner face ot' he end 'it/all; a mach more rigid and substantial ii ,er plete is provided., es result of the stift? ening oi the stepping flanges; and the end wall itself can be made of more sub stantial and rigid design, by providing it with anis-,ily extending annular offset ela. occopying said recess it?, and one that is bettf adapted to transfer tbevery substantial @d oi pump to the barrel or support which is united through the brackets l@ to bed lift claim:

l. arotary pump, an end wall member a shell member, one et which provided .with an axially extending annular odset through which said members meet and by 'which is provided' recess between the end `rail tbe Working space of the pump; e'. liner plate located said recess and easing annular stepping flange that is radially -V"Within the said offset and extends away from said working space and meets said end Wall member and means intereng'aging; with. said flange to secure the plate and wall member together.,

Q. ln a rota-ry pump, Wall member and a shell member one ot" which has an annular coupling flange extending in the direction olf, but rei-note trom, the axis of revolution oi the pump f ad through which the said members are inlited, and e recess is developeri'. between the Wall member and the worle ce of the shell;l and a liner plate losaid recess, andhaving radially e llange first named. an axially exr stepping flange through ding 'which it mees-s t extending bolt receivingr means locatedl 'on' said steppingflange and through which the plate is bolted to the Wall member.

3. ln a rotary pump a .shell member havand bolts securing said plate to said wall member,

4. ln a rotary pump, a shell member havingr a Working space, a wall member united to said shell member in a plane olset in the direction of the axisof rotation from said working' space thereby developing a recess to one side of said working space, a liner plate located between said Wall member and said working' space and constructed with central and marginal stepping langes extendinaaxially away from said Working space and through Which it meets said wall member, said flanges sustaining theJ liner plate in position to form acontinuation of the inner ivall of the Working space and leaving an annular space between said langes, and an inwardly extending annular portion on the Wall member, entering the space between said flanges.

ln a rotary pump, a shell member provided with a Working space, an end wall connected with said shell member but oiset therefrom in the direction of axis of rotation to leave a recess between the working space and the end wall, said end Wall having: annular portions near its center and perimeter, in substantially the same plane, and a liner plate located in said recess and yhavirnq axially extending flanges presented away from said Working space and stepped against the said annular portions of the end Wall, and preserving av portion of said recess tor the reception of bolting means.

, 6. Ina rotary pump, a supporting barrel having an attaching flange, anend wall secured to saidbarrel` a shell constructed Withlv said end'wall being constructed upon its inner 'face with an axially extending annular `offset in 'postionto receiize securing,r means extending from the attaching flange of the barrel and with annular stepping portions, located radially Within and without said- Wall member and radially ciiset, and a liner plate located inthe recess los' les

between the working space and the back continuation of a wall of the working space `plate constructed with flanges extendin and preserving said recess for the reception axially in the direction away from sai of the offset on the back plate and bolt-ing 10 working space and stepped against the annumeans-for the liner plate.

5 lar portions of the back'plate, said liner Signed at Chicago Heights, Illinois, this plate flanges thereby presenting the inner 26th day of August, 1926. face of the' liner plate in position' to form a PERRY I. NAGLE. 

